@ustk ah I mispoke (cue the obvious improve my skills joke here), that works on Visual Studio.
In Xcode what you need to do is to go to the Main.cpp file and where you see this:
TempoSyncer::initTempoData();
// Node registrations ----------------------------------------------------------------------
registerPolyNode<project::node1<1>, wrap::illegal_poly<project::node1<1>>>();
registerPolyNode<project::node2<1>, wrap::illegal_poly<project::node2<1>>>();
registerPolyNode<project::node3<1>, ...
right click on node1 (or the node you want), then use Jump to definition. If Xcode hasn't completely given up with the auto complete (happens sometimes, Apple FTW), it will take you to your node file and open it in a new tab.